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GOODWILL (Goodwill Roll Forward) (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Sep. 30, 2020
Goodwill [Roll Forward] |  |
Balance as of January 1, 2020 | $ 195,043 | $ 195,043
Effect of net foreign currency exchange rate changes |  | (422)
Balance as of September 30, 2020 |  | 207,764
test IO |  |
Goodwill [Roll Forward] |  |
Purchase accounting adjustments | (226) | (226)
Other 2019 Acquisitions |  |
Goodwill [Roll Forward] |  |
Purchase accounting adjustments |  | 311
2020 Acquisitions |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 13,058
North America |  |
Goodwill [Roll Forward] |  |
Balance as of January 1, 2020 | 113,426 | 113,426
Effect of net foreign currency exchange rate changes |  | 98
Balance as of September 30, 2020 |  | 120,842
North America | test IO |  |
Goodwill [Roll Forward] |  |
Purchase accounting adjustments |  | 863
North America | Other 2019 Acquisitions |  |
Goodwill [Roll Forward] |  |
Purchase accounting adjustments |  | 219
North America | 2020 Acquisitions |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 6,236
Europe |  |
Goodwill [Roll Forward] |  |
Balance as of January 1, 2020 | 80,873 | 80,873
Effect of net foreign currency exchange rate changes |  | (457)
Balance as of September 30, 2020 |  | 86,220
Europe | test IO |  |
Goodwill [Roll Forward] |  |
Purchase accounting adjustments |  | (1,089)
Europe | Other 2019 Acquisitions |  |
Goodwill [Roll Forward] |  |
Purchase accounting adjustments |  | 71
Europe | 2020 Acquisitions |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 6,822
Russia |  |
Goodwill [Roll Forward] |  |
Balance as of January 1, 2020 | $ 744 | 744
Effect of net foreign currency exchange rate changes |  | (63)
Balance as of September 30, 2020 |  | 702
Russia | test IO |  |
Goodwill [Roll Forward] |  |
Purchase accounting adjustments |  | 0
Russia | Other 2019 Acquisitions |  |
Goodwill [Roll Forward] |  |
Purchase accounting adjustments |  | 21
Russia | 2020 Acquisitions |  |
Goodwill [Roll Forward] |  |
Acquisition |  | $ 0

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